//////////////////////////////////////////////////////////////////////////////
//
//   Copyright (C) 2002  by Diether Knof
//
//   This program is free software; you can redistribute it and/or 
//   modify it under the terms of the GNU General Public License as 
//   published by the Free Software Foundation; either version 2 of 
//   the License, or (at your option) any later version.
//
//   This program is distributed in the hope that it will be useful,
//   but WITHOUT ANY WARRANTY; without even the implied warranty of
//   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
//   GNU General Public License for more details. 
//   You can find this license in the file 'gpl.txt'.
//
//   You should have received a copy of the GNU General Public License
//   along with this program; if not, write to the Free Software
//   Foundation, Inc., 59 Temple Place, Suite 330, Boston, 
//   MA  02111-1307  USA
//
//  Contact:
//    Diether Knof dknof@gmx.de
//
//////////////////////////////////////////////////////////////////////////////

#ifndef DK_UTILS_VERSION_HEADER
#define DK_UTILS_VERSION_HEADER

#include "date.h"

#include <iosfwd>
#include <string>

namespace DK {
  namespace Utils {
    class Version {
      public:
	static Version* new_from_file(std::string const filename);
	static Version* new_(std::istream& istr);
	static Version* new_(std::string const& s);

      public:
	friend bool operator==(Version const&, Version const&);
	friend bool operator<(Version const&, Version const&);
      public:
	Version(unsigned const major, unsigned const minor,
		unsigned const micro, char const patch = '\0');
	Version(unsigned const major, unsigned const minor,
		unsigned const micro,
		Date const& date);
	Version(unsigned const major, unsigned const minor,
		unsigned const micro, char const patch,
		Date const& date);
	Version(unsigned const major, unsigned const minor,
		unsigned const micro,
		Date const& date,
		bool const release,
		std::string const& description = "");
	Version(unsigned const major, unsigned const minor,
		unsigned const micro, char const patch,
		Date const& date,
		bool const release,
		std::string const& description = "");
	Version(Version const& version);
	~Version();

	std::ostream& write(std::ostream& ostr) const;

	operator std::string const() const;
	std::string number_to_string() const;

      private:
	unsigned const major_; // main version number
	unsigned const minor_; // subversion number
	unsigned const micro_; // subsubversion number
	char const patch_; // character for tha patch version
	Date const date_; // the date
	bool const release_; // whether this is a release
	std::string const description_; // a (short) description
      private:
	Version();
	Version& operator=(Version const&);
    }; // class Version

    bool operator==(Version const& v1, Version const& v2);
    bool operator<(Version const& v1, Version const& v2);
    bool operator<=(Version const& v1, Version const& v2);

    std::ostream& operator<<(std::ostream& ostr, Version const& version);

  } // namespace Utils
} // namespace DK

#endif // #ifndef DK_UTILS_VERSION_HEADER